Electric-arc lamp



(No Model.) 2 Sheets-Sheet 1.

. W. P. FREEMAN.

E LEGTRIG ARC LAMP.

No. 266,455. Patented 0013.24, 1882.

B "A. L 1" J4 Fla] H1 i H h L c a M T W1 TNESSESI INVENTORI .(No Model.) 2 SheetsSheet 2.

W. P. FREEMAN.

ELECTRIC ARC LAMP.

N0.266,455. Patented Oct. 24, 1882.

UNITED STATES PATENT OFFICE.

WARREN l. FREEMAN, OF NEW YORK, N. Y., ASSIGNOR TO \YILLIAM F.

JOBBINS, OF EAST ORANGE,.NE\Y JERSEY.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 266,455, dated October 24, 185 2.

Application filed July 8, 1852.

.To all whom 1t may concern:

Be itltnown that I, WARREN P.FREEMAN, a citizen of the United States, and a resident of the city of NewYorlr, State of New York, have invented certain Improvements in Electric-Arc Lamps, of which thefollowingis a specification.

My invention consists of certain improvements in the construction of electriclamps, my invention having more particular reference to the automatic devices for regulating the feed of the carbons and to the construction of the stationary carbon-holder, as more fully described hereinafter.

In the accompanying drawings, Figure l is a side view, partly in section, of my improved lamp; Fig.2, a sectional plan view on theline 1 2, Fig. 1; Fig. 3, a perspective view of aportion of the regulating devices, and Fig.4 adiagram illustrating the arrangement of the circuits.

The upper cross-piece,A, of the lamp-frame has secured to its outer ends, with insulated connections, as usual, the vertical rods D D, which support the lower cross-piece, E, carrying the stationary carbon holder F, as described hereinafter.

On the circular flatportion ot' the cross-piece A is mounted an arch,A,in which and in the said cross-piece is guided the movable carbonholder B in the usual manner.

On the cross-piece A are mounted in a circle a number of electromagnetic spools, there be ing in the present instance four pairs, GrGrbl G. In thecenterot' this circle is mounted the axis H of the disk-like armature 11 on the adjusting-points i i, passingrespectively through the arch A and cross-piece A. This armature has four radiating pole-pieces; h it h h, correspending with the numbers of pairs of coils Gr G G G each pole-piece having a north and south pole, N. 5., Fig. 3, to he acted on by the south and north poles of the corresponding pair of coils. The position of the armature when a current is not passing through the coils is illustrated in Fig. 2; but when a current is caused to pass throughthe electro-magnets the poles of the armature will be so attracted by the latter as to cause the armature to turn on its axis in the direction of the arrow, Fig. 2,

(No model.)

until it reaches the position shown by dotted lines. Onthisarimtture-diskare mounted,near its axis, two inclined projections or wedges,J, Fig. 3, preferably curved from the center of the axis, as shown in Fig. 2. On the acting faces of these wedges rests the inner end ot'the clamp-lever K, bifurcated in the present i11- stance to embrace the axis 11. l The outer end of the clamp, preferably weighted or provided with a spring, rests on the top of an adjustable stop, L, screwed into the cross-piece, and provided with adjusting and jam nuts 1 to vary the angle of the clamp K.

On the cross-piece A is also mounted a resistance-coil, O, in a shunt-circuit between the two binding'posts d d, as shown in the diagram, Fig. 4.. The wire 1, leading from the binding-post d, has four branches, 2, 3, 4, and 5, connected to the coils of the four pairs of eleetro-magnets G G G G respectively,and the other terminals from these four pairs of coils are electrically connected to the crosspiece Asay at (i-and the current thence passes through the wire 7, Fig. 1, upper-carhon holder B, carbons, lower-carbon holder F, cross-piece E, rod D, and out at it, One of the terminals, 8, of the resistance-coil O is connected to the post (1 either direct or through the medium of one of the branches 2, 3, t, or 5, while the other terminal, 9, is connected to the post 61.

When a current is first passed through the lamp the clectro-magnets G G, 850., will cause the armature H to turn and the wedge-projections J to raise the inner end of the clampiever K, which consequently raises the upper carbon-holder, separates thecarbons, and forms the are. As the consumption of the carbons increases the resistance in the main workingcircuit the current will leak through the sh untcircuit containing the coil 0, and the armature will be induced by the weight of the carbonholder B and clamp K,with or without the aid of a spring, to return to the position shown by full lines in Fig. 2, when the carbon-holder B will be released and move toward the stationary carbon, to be immediately grasped again by the clamp in the usual manner.

I prefer to mount the resistancecoil adjacent to the armature and form on the core a flange or projection, 0, close to the edge of the armature, so that when thelatter returns to theposition shown by full lines the magneticaction of the flange 0 will act in place of a dashpot to case the recoil.

The lower-carbon holder F is carried by two circular disksff, which have beveled orcurved edges adapted to correspondingly-curved seats 0 c in the circular portion of the cross-piece E, and these two disks are secured together by screws/"j". These disks thus form a universal joint, by which the O21'bO11-llOltl1F may be adjusted and brought in line with the upper carbon and secured after adjustment by tightening the screws j".

I claim as my invention 1. The combination of the movable carbonbolder and clam p-levcr 01" an electric-arclamp with electro-magnets and a rotary armature carrying wedge-projections to operate on said clamp, substantially as set t'orth.

2. The combination of the movable carbonholder and clamp of an electric arclamp with electromagnets, armature having radiating pole-pieces mounted on an axis and provided I with wedge-projections, on which one end of the said clamp rests.

3. The combination of the clamp of an electric-arc lamp with a rotary armature operating said clam p, and havinga series of radiating pole-pieces, each with a north and south pole, and a correspondingn umherot' pairs of electromagnetic coils, substantially as described.

4. The combination of the electro-magnets, rotary armature and clamp operated thereby, with a resistance-coil whose core has a flange or projection adjacent to and adapted to act on said armature.

5. An electric lamp having its stationary carbon-holder secured to a pair of disks,f with curved edges secured togetherand adapted to corresponding seats in the frame, sub' stantiall v as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

\VARREN' 1. FREEMAN.

Witnesses:

FRANKLIN BISOHOFF, .Itonmrr llowsozv. 

